package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {
    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate){

        this.stringRedisTemplate=stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //  1.获取请求头中的token
        String token=request.getHeader("authorization");
        if(StrUtil.isBlank(token)){
           return true;
        }

        //  2. 基于TOKEN获取redis中的用户
        String key=RedisConstants.LOGIN_USER_KEY+token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash()
                .entries(key);

        // 3. 判断用户是否存在？,但是这里不用拦截，对于全部的信息都实现放行
        if(userMap.isEmpty()){
            return true;
        }

        //  5. 将查询到的Hash数据转化为USERDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        // 6. 存在，保存用户信息在ThreadLocal
        UserHolder.saveUser(userDTO);

        //  7. 刷新token的有效期
        stringRedisTemplate.expire(key,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);

        // 8. 放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 移除用户
        UserHolder.removeUser();
    }
}
